Archive for the ‘Do It Yourself’ Category:

2024-04-20 RCWL-0516 Microwave Doppler Motion Sensor Module Schematic KO4BB

The modules use both the RCWL-9616 and the BISS-0001 but it seems the schematics are all labeled BISS-0001.  The parts values are different.  He gives some good information about them.  They operate at 3.5 and 3.98 GHz – the ones I have were advertised at 5 GHz.  Also he shows his own version that uses a

(Read More…)

2024-04-16 White Vinegar Isn’t Neutralizing NiCad Electrolyte

I put white vinegar on the areas where the NiCad juice turned the PCB green, and it didn’t seem to do anything.  So after awhile I washed it off with plain tapwater.  I used a soft brush and a lot of the green coating washed off.  It’s not in very good shape.  I’m wondering if

(Read More…)

2024-04-10 FM Regenerative Receiver Using MPF102 JFET

A basic one transistor regen receiver uses an MPF102 JFET to give the regenerative gain.  Also uses two transistors to amplify the audio to drive an earphone.  How to Build an FM Radio Receiver

2024-03-31 LoRa Modules From Reyax

Supposed to have 10 to 14 km range.  But probably at very low data rates.

Tags: ,

2024-03-30 MX20T Link Switch Port Tester

A long time ago when we were going to Cat5 UTP, I had a lot of these MX20Ts left over.  So I made up a 15 pin plug with the negative 9VDC on pin 6 and positive on pin 13, and soldered the wires to the battery contacts.  I taped the battery to the back

(Read More…)

2024-03-29 FM Crystal Set Uses Helical Resonator For Tuning

This is a long article but a very interesting project.  It uses HSMS-2850 Schottky detector diodes in a discriminator.  He uses WE 1200 ohm sound powered headphones.  He’s Canadian.

2024-03-26 HVDC Module Teardown, Operation And Explanation

A 41 min. YouTube video shows operation, tears down, and explains the components.  It seems that they are made with cheap chinesium components that are too low voltage ratings so they will fail prematurely if the HVDC is left on a long time or if the spark gap is too wide.  Schematic from video is

(Read More…)

2024-03-22 USB Power Delivery Trigger Adapter

Some important information for those who wish to power their projects with a USB C “power delivery” adapter.  You may need one of these. This is a YouTube short video.

2024-03-11 Flexible LED Filaments

Some information on what current and resistors to use.  The LEDs are all in parallel and need about 3 Volts, current limited with a resistor.

2024-03-10 Radio Shack P-Box List, Assembly Manual, Schematic Info

This seems to be pretty much all of the kits.

© RustyBolt.Info/wordpress